## Average speed question help?

Question

A vehicle joins a motorway and travels at a steady speed pf 25 m s-1 for 30 mins then it travels a further distance of 40 km in 20 min before leaving the motorway.

Calculate its average speed on the motorway.

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General Physics
4 years
1 Answer
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## Answer ( 1 )

25 m/sec = 25*3.6 = 90 km/h

90 km/h*0.5 h = 45 km

total distance d = 45+40 = 85 km

total time t = 1/2+1/3 = 5/6 of hour

average speed = d/t = 85*6/5 = 102 km/h